Cap for jars and cans



June 5, 1928.

1 s. N. TEVANDER CAP FOR JARS AND CANS Filed May 8, 1926 cZer.

Patented June 5,1928.

UNITED STATES SWAN N. TEVANDER, OF MAYWOOD, ILLINOIS.

.CAP FOR JARS AND CANS.

Application filed May 8,

The purpose of this invention is to provide a form of can cover of the metal type which shall involve sufficient resiliency to insure a firm seating against the neck of the can or bottle to which it is applied, even though the latter may not be perfectly square with the axis of the vessel. It consists of certain features of construction in combination as herein shown and described and a indicated by the claims.

In the. drawings:

Figure 1 is a'side elevation of the upper portion of a glass jar fitted with a cover embodying this invention.

Figure 2 is an axial section of the same showing the cover screwed down into initial engagement with the neck of the jar at one side.

Figure 3 is a similar axial section showing the cover tightened into complete engagement with the neck of the jar.

Figure 4 is a detail section being substantially an enlargement of the right hand upper corner of Figure 3.

Figure 5 is a detail section taken substantially as an enlargement of the left hand upper corner of Figure 3.

Figure 6 is a transverse section taken through the cover alone and showing a modified arrangement of the paper lining there- 1n.

Figure 7 is an enlarged section" to illustrate the feature shown in Figure 6.

The can cover which is the subject of this invention is formed of pressed sheet metal and includes a pressed thread at 1, adapted to fit the cast threads on the neck of the jar, 2, which maybe of glass or like material. Preferably the metal stock from which the cap is made has united to its inner surface a layer of paper, 3, suitably impregnated to make it substantially impervious to liquid so that it may serve as a sealing gasket between the marginal portion, 4, of the top of the cover and the edge, 5, of the neck of the jar, 52.

It frequently happens that the edge, 5, of the ja mouth does not lie wholly in the same plane or does not lie in a plane strictly perpendicular to the axis of the jar. In this event an ordinary screw cover will seem to be tight'when its under surface strikes the highest point of the edge, 5, but it cannot be drawn down into sealing contact with the entire edge. To overcome this difiiculty I form in the flange of the cap an outwardly 1926. Serial No. 107,612.

pressed or crimped bead, 6, located between the marginal portion, 4, of the top and the threads, 1, which are pressed in the lower part of the skirt or flange of the cap. As initially made, the material of the head, 6, is substantially doubled upon itself as seen in Figure 2, and when first applied to a jar, 2, in which the edge, 5, of the neck is not strictly in a plane at right angles to the axis of the jar, the cap will stop at a position shown in Figure 2 at which the marginal portion of its top, 4, is in contact with the highest part of the edge, 5, but remains out of contact therewith at the opposite side, as indicated at 7. The material of the cap is sufliciently yielding, however, so that the cover may be screwed down further, thus forcing open the bead, 6, as shown at 6*, in Figure 3, permitting the top margin, 4, to remain seated against the highest portion of the edge, 5, while the threads of the cover draw said margin down into seating contact all around the edge, 5, even at the lowest portion thereof. Thus while the cover is slightly distorted, the paper lining, 3, is brought into firm sealing contact with the edge, 5, of the jar so that the contents will be effectively preserved against leakage or spoilage. I

As a modification, I have shown in Figure 6 a cap in which the lining paper, 3*, terminates in the bead, 6, which thus serves the additional function of initially securing the lining in position. After the cap is once applied to the neck of the jar, the paper, 3*, is definitely positioned so that it is immaterial whether or not the bead, 6, is sprung open as at 6*, in Figure 3 in the final seating of the cap.

Besides insuring a firm seating of the cover against the edge of'the mouth of a jar or can, the crimped bead, 6, serves another useful purpose. lVhen the jar contains food stuffs such as fruit preserves, it is nesessary to raise the temperature of the contents to the boiling point or possibly higher to protect it against bacteria. and since this is done after the jar is sealed, it results in a considerable pressure outward upon the cap due to the tendency of the contents to expand under the heat treatment." If a non-elastic screw cap were employed, it would tend to be bulged out of seating contact with the jar by this pressure, and would ordinarily take a permanent set which would leave the jar imperfectly sealed after cooling. YVithmy yielding bead, 6, the cap is permitted to expand somewhat in response to the pressure produced by the heating process, but upon cooling the elasticity of the material at the bead, 6, will pull the marginal portion, 4, of the cap back against the head of the jar into firm sealing contact.

I claim':- I

1. In combination with a can or jar having a threaded neck, a cap of bi-laminar sheet material comprising an outer layer of metal and a compressible lining formed with a threaded flange to engage said neck, said flange having an annular bead formed by crimping the material of the flange outwardly between the top of the cap and the threads of the flange, said bead providing a yielding connection between the top and the threads to secure a firm seating of the compressible lining of the top against the end of the neck.

2. A can cover comprising a metallic top adapted to fit against the neck of a can, with an integral flange formed for locking engagement with the neck of the can adapted to draw the top against the end of said neck and including a crimped bead disposed in a plane between the top of the cap and its locking means, said head providing a resilient connection between the locking means and the top; and a relatively soft compressible lining extending integrally over the entire inner surface of the top and flange and united therewith, said lining being crimped into the bead and the lower edge of the flange being seamed over the lining, to protect the latter against rupture or separation from the metallic flange.

A can cover comprising a top adapted to lit against the neck of a can and an integral flange formed for locking engagement with the neck of the can and including a circumferentially exending crimped bead disposed in a plane between the top of the cap and its locking means to provide a resilient connection between said locking means and the top, said cover being formed of hilaminar sheet material comprising an outer layer which furnishes the required resilience at said bead and an inner layer of compressible material permanently secured to the outer layer serving as a lining for directly engaging the neck of a can.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 6th day of May, 1926.

SWAN N. TEVANDER. 

